JP2694874B2 - Sheet material punching device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for processing a hole such as an indication of the frequency of use of a magnetic card used in a magnetic card type public telephone. is there.

[Conventional technology]

Conventionally, as a card punching device used for this kind of application, as shown in JP-A-57-105082 or JP-A-61-12153, a punch is driven by an electromagnetic solenoid. There is something.

Further, as a punch driven by a motor, there is Japanese Utility Model Laid-Open No. 61-147459.

[Problems to be solved by the invention]

Among the above-mentioned conventional techniques, the one using an electromagnetic solenoid generally consumes a large amount of power, and in order to stably punch out a magnetic card used in an ordinary magnetic card type public telephone, it is necessary to instantaneously supply 50 to 100 watts or more. There was a drawback that it would consume less power. On the other hand, in the case of using the motor, the power consumption can be suppressed to less than half that of the electromagnetic solenoid, but it is necessary to reduce the rotation of the motor and then convert it into the reciprocating motion of the punch. Therefore, compared with the one using the electromagnetic solenoid, the mechanism is generally complicated and large, and the cost is high.

INDUSTRIAL APPLICABILITY The present invention makes it possible to provide a mechanism as a simple and small-sized one at a low cost while suppressing the power consumption by using the rotational power of a motor, and / or to reduce the thickness, which is also a strong requirement, that is, the dimension in the thickness direction of the sheet. An object of the present invention is to provide a punching device for a sheet material, which can be easily made small.

[Means for solving the problem]

The sheet material punching device of the present invention is provided with a die and an urging force in a direction away from the die, and is axially movably supported by both ends, and one end cooperates with the die. A punch that performs a punching action, an end surface cam that has an inner diameter that is rotatably supported by the punch, and has an end surface provided with an uneven cam surface in the axial direction, and a cam follower that is provided on the punch and that contacts the cam surface by the biasing force. And a sheet material punching device comprising a motor for rotationally driving the end surface cam.

By using the cam, it is possible to make it significantly simpler and more compact than the one in which the rotary motion of the motor is converted into the linear motion by the crank mechanism or toggle mechanism, and by devising the uneven shape of the cam. The rotary torque can be more effectively used for the thrust of the punch than that using the crank mechanism or the toggle mechanism, and the power consumption can be further reduced. Further, by using this cam as an end face cam, it is possible to reduce the thickness. In other words, the end face cam device can be remarkably reduced in size in the stroke direction as compared with other types of cam devices.

Further, in the device of the present invention, since the punch itself also serves to support the rotation of the end face cam, the number of parts is reduced and the structure is extremely simplified.

In the apparatus of the present invention, if a pin is used as a cam follower that intervenes between the pin and the cam to transmit drive, and the elastic deflection of this pin is also used for the punch return spring, the mechanism can be further simplified. .

FIG. 1 is a graph showing the relationship between the rotation angle θ of the end face cam and the stroke x of the punch. Normally, the gap through which the card passes is sufficiently wider than the thickness of the card. The force required to drive the punch is small from the standby position (point O) to the position where the punching is actually started (point A), and a large force is required until the position where the punch penetrates the card (point B). Therefore, the shape of the end face cam during this period can be freely designed according to the load and the shape of the punch, and the ratio of the punch stroke (dx / dθ) to the cam rotation angle can be freely designed. In contrast, the crank mechanism and toggle mechanism can select only the characteristics close to a sine curve,
The driving torque of the motor can be more effectively converted into the thrust of the punch.

FIG. 2 shows an embodiment of the present invention, in which punch 1a is used.
Is held in a D-shaped circular cross section at the upper end in a hole of a frame of the same shape and can only move vertically up and down. The end face cam 3a integral with the drive gear 2a rotates on the axis of the punch 1a. It is installed freely.

The pin 4a penetrating perpendicularly to the punch 1a has an outer peripheral surface in contact with the end face cam 3a, and the rotation of the end face cam 3a having a V-shaped groove is converted into thrust of the punch 1a via the pin 4a.

The extensible spring 5 has a function of constantly pushing the pin 4a upward to restore the punch.

Further, a disc 6a with a cutout is fixed to the end face cam 3a, and the drive for the motor 8 is controlled by detecting the cutout portion with a photo sensor 7a, and a control for stopping the punch 1a at a predetermined position is performed. Generate a signal for performing.

The punching device for a card having such a structure is a motor 8
Rotation is reduced by a gear that is a power transmission means engraved on the outer peripheral portion and at the same time boosted and transmitted to the cam 3a, the edge of the V-shaped groove of the cam 3a pushes down the pin 4a, and punches through the pin 4a.
Converted to thrust of 1a, a hole is punched in the card 10 between the die 9 and the tip of the punch 1a, and then the spring 5 causes the punch 1a to start returning upward, and the notched disc 6a The notch is detected by the photo sensor 7a, the rotation of the motor 8 is stopped, and the punch 1a returns to the original standby position.

In this embodiment, the punch itself is used as the support shaft of the cam in addition to the following embodiment, and the structure is further simplified. The term "thinning" in the present invention includes the case of FIG. 2, that is, although the motor 8 in the drawing projects upward, the motor 8 normally returns the endless belt (not shown) that conveys the card 10. This is because it does not interfere with the path (usually passing above the punch).

3 and 4 are a sectional view and a PP sectional view, respectively, of a second embodiment of the present invention.
The punch 1b has both ends supported by the frame 11 and is movable in the axial direction.The end face cam 3b, the worm wheel 2b, and a cylindrical cam 6b having a notch for position detection are integrally formed into a cam. The gear unit is rotatably supported coaxially. The pin 4b, which penetrates the punch 1b at right angles, has both ends thereof held in holes formed in the frame 11. The cylindrical cam 6b operates the switch 7b at a predetermined position to move the motor 8
Generates a signal that controls the rotation of the.

The punching device for a card having such a structure is a motor 8
Is rotated by the worm wheel 2b and transmitted to the cam 3b, and the pin 4b is pushed downward to drive the punch 1b. Pin 4b
Since both ends are supported by the frame 11, the punch 1b
And the role of restoring the punch 1b when the cam 3b further rotates due to elastic bending.
It also serves as a rotation stopper for 1b.

When the card punching device is used in this way, the reduction gear only needs to be a pair of worm gears, and the pin doubles as a spring to stop rotation of the punch and to return the punch. can do.

Further, although the signal for controlling the rotation of the motor 8 indicates the method of detecting the rotational position of the gear, the signal may be detected by detecting the position of the punch.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The present invention can provide a simple and inexpensive sheet material punching device that uses an end face cam to simplify the structure and make it thin, and that consumes less power by driving a motor. It is a thing.

The present invention has been described above mainly for the card, but the present invention is not limited to this and can be widely applied to sheet materials in general.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the rotation of the end face cam and the stroke of the punch of the present invention, FIGS. 2 and 3 are sectional views showing another embodiment of the present invention, and FIG. Third
It is the PP sectional view of a figure. 1: Punch, 2: Gear, 3: End cam, 4: Pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-126148 (JP, A) JP-A-1-197889 (JP, A) Actually open 59-17446 (JP, U) Actual-open Sho 61- 12154 (JP, U)

Claims (6)

(57) [Claims] 1. A die, a punch to which an urging force is applied in a direction away from the die and which is movably supported in the axial direction at both ends, one end of which cooperates with the die to perform a punching action, The inner diameter is rotatably supported by the punch,
A sheet material comprising: an end surface cam having an end surface provided with an uneven cam surface in the axial direction; a cam follower provided on the punch and in contact with the cam surface by the biasing force; and a motor for rotationally driving the end surface cam. Drilling device. 2. The punching device for a sheet material according to claim 1, wherein the cam follower is a pin which is inserted into a hole provided at a right angle to the punch. 3. The punching device for sheet material according to claim 2, wherein the elastic deflection of the pin is used to apply the biasing force. 4. The sheet material punching device according to claim 1, wherein the end surface cam is formed integrally with a driving gear. 5. The sheet according to claim 1, further comprising a detector for generating an electric signal for controlling the standby position of the punch by detecting the rotational position of the end face cam. Material punching device. 6. When the punch is in the standby position,
6. The sheet material punching device according to claim 1, further comprising a detector for generating an electric signal for controlling the driving device.